urxvt bidi fails when more than one diacritic

[pmaziere]

Hello,

When testing your urxvt perl extension bidi on torah text, it shows question marks when it seems to encounter more than one diacritic

׃ץרֶאָֽהָ תאֵ֥וְ םיִמַ֖שָּׁהַ תאֵ֥ םיהִ֑לֹאֱ ארָ֣בָּ תישִׁ֖ארֵבְּ

gives
??א?ית ??א ???ים ?ת ???יִם ??ת ???ץ׃

An example file can be found here

I don't know if this is related, but I noticed that you defined nikudim characters as range [\x{5b0}-\x{5bb}]
I suggest that you also include taamim and modify this range to [\x{591}-\x{5bd}\x{5bf}\x{5c1}\x{5c2}\x{5c4}\x{5c5}\x{5c7}] which also exclude some punctuation mark that are not diacritics.

Thanks for taking the time to look at this issue.

[Konfekt]

Is this due to so-called shaping, replacing two or more characters by a single combined one?